Reproducing needle for talking machines



- f D. HALL REPRODUCING NEEDLE F 12 TALKING MACHINES Filed March 4. 1 922- Patented Feb. 12, 1924,.

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PATENT OFFME.

HALL, 01" CHICAGO, ILLINOIS, ASSIGNOR TO HALL MFG. 00., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

- nnr'non'oc'me' NEEDLE FOB} TALKING mncnmrs.

Application filed March 4, 1922. Serial No. 541,019.

. To all whom it mag concern:

Be it known that I, FREDEBICK' D. HALL, a citizen of the .United' States, residing at Chicago, in the county of Cook and State of 5 Illinois, have invented a certain new and useful Improvement in Reproducing Needles for Talking Machines, of which the following is a full, clear, concise, and exact description, reference being had to theaccom- 1 panying drawings, forming a part of this specification.

My invention relates to reproducing nee-. dles for talking machines, phonographs and similar instruments One of the objects of the invention is to provide a' practical and efficient form of needle of the class specified.

Another object of the invention is to secure a high degree of excellence in the combined action of needle and record.

Another. object of the invention isoto, secure accuracy of rendition and fine tone quality. I

Another object of the invention isto prolong the efiective life of the needle.

Another object of the invention is to ar-' range for the economic and advantageous manufacture of the needles in quantity.

In the accompanying drawin Fig. 1 is a side elevation of a needle em odying my present invention; I

Fig; 215 a rspective. view of the same on an enlarge scale;

Fig. '3 is an end view on a still larger scale;

Fig. 4 is a side view on the same scale as Fi 3; and

-Fig. is an end viewof 'a modified form of construction.

Referring to the drawings, 1. show a nee dle indicated as A adapted for use for talkillrg machines, phonographs and similar mac nes.

fiber, suchas bamboo, orother vegetable matter although other materials: could be used. When made of bamboo or other fiber, the I ain of the fiber preferably runs lengt wise of the needle.

.The needle is preferably of a general triangular cross section, having longitudinal sides 1., 2 and 3, as best shown in Figs. 2 and The needle shown is preferably made of with two angularly 3, the side 1 being the outer surface of the bamboo material, having an outer skin or corte 1. One end is cut to form an inclin'e or sloping surface 4, which produces a point 5 at its junction with the corner or edge 6 between sides 1 and 3. The surface 4 alsopreferably slopes or inclines slightly away from side 1 to make a sharper edge and point, as shown in Fig. 4.

In accordance with my present invention at least one of the sides 2. or 3 is longitudinally scooped or hollowed out. In Figs. 1 to 4, inclusive, both sides 2 and 3 are scooped or hollowed out; in Fig. 5 only side 3, side 2 being flat. By such arrangement, the point 5 will be sharper and longer, due to the concavity of sides 3' and 3. Thus better action of needle or record is secured, better tone quality, greater accuracy, and longer effective life of needle.

The arrangement of Figs. 1 to 4:, with both thesides 2 and 3 hollowed or scooped out, is preferred, as this is advantageous from a manufacturing standpoint. By such arrangement, the point 5 may be formed at the junction of sides 1 and 3,-or 1 and 2, and so it is unnecessary in cutting the points 5, to discriminate between sides 2 and'3, and the needles may be fed and cut accordingly. In the arrangement of Fig. 5, point 5 must 'be formed at junction of sides 1 and 3, and

consequently needles must be out accordingly and time would be taken by operator toexamine and position needle properly.

It will be understood that changes and modifications may be made without departin from the spirit of the invention.

hat I claim is:

1. A needle of, the class specified comprising a strip having a point formed at the junction-of two angularly disposed longitudinally extending meeting sides, one 'of which is longitudinally scooped or hollowed.

ing a strip having a p'oint formed at the junction of two angularly disposed longitudinally extending meeting sides, one of which is longitudinally scooped or'hollowed and the other of which is plane .3. A needle of the class specified comprising a strip of bamboo material provided 2. Aneedle of the class specified comprisdisposed longitudinally extending meeting sides one of which has a skin or case provided by the outside of the bamboo material and the other of which is longitudinally scooped or hollowed. v

4. A needle of the class specified comprising a strip of bamboo material of general triangular cross section, one of said sides being the outer side of the bamboo material and the other two sides being longitudinally scooped or hollowed. I

In Witness whereof, l hereunto subscribe my name this 2nd day of February,

FREDERICK D. HALL. 

